Tool retainer



April 14, 1931 H. c. GUsTAFsoN 1,800,345

TOOL RETAINER Filed July 15, 1927 3 Sheets-Sheet l I 24* if:

atto: nud

April 14, 1931- H. c. GUsTAFsoN 1,800,345v

TOOL RETAINER Filed July i5, 1927 3 Sheets-sheet 2 H. C. GUSTAFSON TOOL RETAINER Filed July l5, 192'7 3 Sheets-Sheet 3 Symantec! 6T @rma/L @H201 um,

WML

April 14, 1931.

Patented Apr. 14, 1931 UNITED S'IA'rrisv PATENT OFFICE IIJ'ALMER C. GUSTAFSON, OF DENVER, COLORADO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE GARDNER-DENVER COMPANY, OFV QUINCY, ILLINOIS, A CORPORATION OF DELAWARE TOOL RETAINER Application ined :ruiy 15,

Figure 2 is a detail sectional view of the chuck end of the tool, showing the retainer in its operative position,

Figure 3 is a view similar to Figure 2,`but

v showing the retainer elements in their active positions,

Figure 4 is a horizontal sectional view taken substantially on the line 4-4 of Figure 3 Figure 5 is a cross sectional ,view on the line 5-5 of Figure 2,

Figure 6 is a plan view of the retaining dogs in the position illustrated in Figures 3 and 4, f y

Figure 7 is a side elevation of the parts shown in Figure 6, v

Figure 8 is a perspective view of the parts as shown in Figures 6 and 7 Figure 9` is an innerv face view of one of the retaining dogs. 1

Figure 10 is a viewk in elevation ot the housing and exposed portions of a modified form of construction, A

Figure V11 is a longitudinal sectional View therethrough, showing the retaining dogs in `their inoperative positions, y

Figure 12 is a horizontalsectional view taken on the line showing the retaining dogs in theirfoperative positions and locked against opening,

- Figure 13 is a view similar to Figure 12, but showing the dogs unlocked and in position to be opened, Y

Figure 14, is a view similar to Figures 12 and 13 but showing the dogs in their open positions or as illustrated in Figure 11.

` In the embodiment disclosed in Figures 1-8 inclusive, the tool is illustrated generally at 15, and embodies acylinder member 16, in 50 which a reciprocatory'piston hammer 17 op- 12-12 of Figure 11, but P the simultaneous dogs.

` Figure i927, serial No. 206,050.

erates. This hammer is adapted to deliver Y blows to the end of a drill steel' 18, orfother instrument 'that is engaged in a chuck 19,

forming the front end of the'tool. The steel l orimplement 18 is provided with a collar 2O that limits its movement into the chuck, and also is madeusev of in preventing the steel being detached.

` A. tubular housing 21 is mounted on the,

front end of the chuck 19, and has an inturned front wall 22 surrounding an opening 23,

through which the steel V18 passes, said opening being of sufficient diameter to also permit the passage of the collar 20. The housing-is povided in its opposite walls withopenings `Opposite retaining dogs 25 are provided that are preferably substantially semi-circular in Jform, and have their outer ends roundn ed to provide knuckles 26 that constitute pivotal bearings, against the inner face of the inturned end wall 22 of the housing 21. These dogs form an inwardly tapered opening when in the position shown in Figures v1,3 and 8,

the opening being of sufficient diameter toY permit thepassage of the shank'of the steel "18, but of less area than the collar 20. A

coiled spring 27 is interposed between the front end ot the chuck 19 and the rear ends of thel dogs, said springs thus serving to swing the dogs forwardlyor to their operative pocsitions. One of the dogs has an outstanding extension 28 that engages in one of the openings 24 and the other hasan opposite extension 29 that passes through the other opening and projects suiiciently far to form a iinger-piece. The outer kends of the 'dogs are rovided, one with a transversely extending lug30, the other with-asocket' 31to receive the same, the inner wall 32 ofthe socket forming a shoulder or toothfsovthatwhen the nger-piece 29 is moved forwardly, the lugs 30 'bearing against thefshoulders 32, willcause inward swinging of both The openings 24, as shown particularly in 4, are considerably widerthan the extensions 28 and 29. Consequently the dogsv are permitted to have a partial rotary movement. These dogs are'provided on diagonally opposite sides ofthe extensions 28 and 29 with looking lugs 33 that are adapted to move to positions behind the wall of the housing, as shown in Figure 4, or to positions to swing into the openings 24e, as shown in Figure 5.

With this construction, it will be evident that when the dogs are turnedso that the holdinglugs 33 are in alinement with the openings 24, by pressing outwardly upon the finger-piece v29,-the dogs can be swung to openposition as illustrated in Figures 2 and 5. Villen so opened, the collar ot the steel can pass the dogs and consequently said steel ean be removed or replaced. TvVhen the. collar is behind the dogs and the iinger-pieee 29 'is -released, the springwill act to swing theidogs forwardly and inwardly behind vthe eollaror as indicated injFigures land 3, thus retaining the tool in place. By turning the finger-piece '29, the dogs are caused to rotate, sogthat the "lugs 33 are carried-behind vthe walls of thehousing, orto the position shown in Figure e, whereupon the dogs are positively locked against ope-ning.

Means also may be provided for locking the-dogs in open or in their inoperative positions, and such a structure is shown in lFigures l0 to 14; inclusive. The parts heretofore .described areV given the same reference numerals with the exponent a, and it is believed need not be further described. In adfdition, yit will be noted that the housing 21a has at one side of the opening 24a through which .the ,finger-piece 29a passes, a lug 84; .and lthat the opening 24a has a reduced eX- vtension 24?) disposed alongside said lug. The V eonse pueneeis that when the dogs are thrown yto their open position, or as shown in Figure llandare rotated in a reversedirection to that on Vwhich they are moved to look, then the linger-piece 29a vis brought beneath the lug 84 and the parts are locked in open `position, asshown in Figure l1.

From the foregoing, it is thought that the construction, operation and many `advantages ,of the herein described inventien will be apparentto kthose skilled in the art, without further desoriptiomand it willbeunderstood that-various tChano-es in the size, shape, proportion and minorfdetails of eonstruotion may be resorted to without-departingfrom the spirit or sacrificing any of the advantages lof .the invention.

mountfing `iin-the housing transversely toits swinging lmovement into .and yout Of engagement vwith said Vlocking means.

2. Artool'retainer :comprising a housing,

a tool retaining dog pivotally mounted therein and movable between an operative position and an inoperative position, and means for locking the dog in its operative position, said dog being capable of'movement on its pivot mounting in the housing transversely to its swinging ,movement into and out of engagement with said locking means.

3. A tool retainer comprising a housing, a tool retaining dog pivotally mounted therein and movable betweenan operative position and an inoperative position, and means for looking the dog in its inoperative position, said dog having a mounting that permits its movement transversely to its swinging movement into and outlet engagement with said looking means.

t. A tool retainer comprising a housing, a tool-retaining dog having a pivotal mounting therein and movable between an opera.- tive and an inoperative position, and means for lool-:ing the dog in one of said positions, said dog being Capable ova rotary movement on its pivot mounting vin the-housing vinto and out of engagement with ,thelookingl 5. A tool retainer Comprising a'housing, a tool-retaining dog having a pivotal mounting therein and movable between Van operative and an inoperative position, and alloelr`4 95 ing lug carried by the dog, said housing having an opening and a looking -wall adjacent thereto, and said dog being `capable 'of rotary movement on its pivot mounting in the housing to bring the lug .behind the wall and into alinement with the openinO.' Y

6. A tool retainereomprising a housing, a tool retaining dog pivotally mounted therein and capable of swinging between an operative position and an inoperative position,

an outstandingV finger piece carried by the Vdog and projecting through the housing-and a holding shoulder on the housing, said dog being capable of rotaryY movement to carry the finger piece to a position into engagementv with theshoulderto holdthe dogagainst swinging movement.

7. A tool retainer comprising a housing, a tool retaining dog pivotally mounted. thereinand capable of swinging between an operative position and` an inoperative position,

.an outstanding finger piece Carried bythe dog and projeeting through the housing, and a .holding shoulder on thehousing, said dog being capable of rotary movement whenl in its inoperative position to carry the linger pie-ce .to aV position into engagement with the shoulder tohold the dog against swinging movement ,and-in said inoperative position.

V.8. A toolretainer Comprising a housing having an opening in its side wall and provided with a lug alongside, a tool retaining dog pivotally mounted therein Y and Capable of swinging Vbetween an operative position and Lan inoperative' posities, an `@nietaiidile' through the opening, said dog being capable of rotary movement to carry the inger piece behind the lug when the dog is in itsinoperative position and thereby hold it in said inoperative position and said dog also having a lug that is movable upon a reverse rotary movement of the dog to a position behind the wall oit' the yhousing to holdk the dog in its operative position.

10. A tool retainer comprising a housing having an open end for the reception of the tool, opposite openings in its side walls and a holding lug alongside one of the openings, interfitting tool-retaining dogsy having pivotal bearings in the housing and capable of rotary movement on said bearings, said dogs being capable of swinging movements between operative positions and inoperative positions and having outstanding elements engaged in thev housing openings, one of said elements engaging behind the lug upon the rotation of the dogs when in inoperative positions, hind the housing walls and lock the dogs in operative positions on their rotary movement in an opposite direction.

11. A tool retainer comprising a housing, a tool retaining dog pivotally mounted therein and movable on its horizontal mounting between an operative position and an inoperative position, means for urging the dog to its operative position, and means for locking the dog in its inoperative position and against the urge of the said means.

12. A tool retainer comprising a housing, a pair of tool encircling retaining dogs pivotally mounted therein and capable of swinging between operative positions and inoperative positions, a tool encircling spring that bears on the dogs to urge them to their operative positions, and means for locking the dogs in their .inoperative positions and against movement by the spring.

In testimony whereof, l aiX my signature.

HJALMER C. GUSTAFSON.

and lugs on said dogs that engage be- 

